THE FRESH-WATER LOCHS OF SCOTLAND. 



273 



Oto 50 feet 

 50,, 100 

 100,, 150 

 Over 150 , 



482 acres 

 385 

 208 

 54 



1129 , 



42 '7 per cent. 

 34-1 

 18-4 

 4-8 



100-0 



Temperature Observations. The following table gives the results of 

 observations taken in Loch Luichart by Mr. Clark on August 25, 1901, 

 and by the Lake Survey on August 16, 1902 : 



The range of temperature shown by the 1901 observations amounts 

 to 10, while that shown by the 1902 observations amounts to 8. The 

 temperature of the upper 60 feet of water was higher in 1901 than was 

 observed in 1902, as was also the case at a depth of 100 feet, but a 

 lower reading was recorded at 80 feet in 1901 than at 70 and 75 feet in 

 1902. The two serials taken in 1902 show the effect of the strong wind 

 which was blowing up the loch at the time of the survey, the maximum 

 temperature observed extending down to a depth of 70 feet near the 

 head of the loch, whereas 1J miles further down the loch the temperature 

 was always lower, amounting to a difference of l-2 at 50 feet and 4 0< 4 

 at 70 feet, beyond which depth a much larger fall of temperature was 

 observed towards the head of the loch than was recorded farther down 

 (equal to a fall of 7'5 in the interval of 20 feet between 70 and 90 feet 

 in the former case, and a fall of 3-2 in the interval of 25 feet between 

 75 and 100 feet in the latter case). 



Loch Beannaclian (see Plate LVIIL). Loch Beannachan (or Ben- 

 nachran) is situated at the head of Strath Conon, amid wild moorland 

 scenery. It trends in a west-north-west and east-south-east direction, 



T 



